user-agent * -> An entry that applies to all bots
Disallow: /Blog/ -> URLs matching /Blog/ would be disallowed for Googlebot (and everything in this directory).
Allow: /Blog/post -> URLs matching /Blog/post would be allowed for Googlebot (and everything in this directory).

the answer depends of your requirement, if u want to allow blog/post but disallow blog then use the 1st case, other wise use the 2nd one.

If you end with a "/" then it will specify that as the match.That means this; Disallow: /wp-includes/will block these; Disallow: /wp-includes/this.html Disallow: /wp-includes/that.php Disallow: /wp-includes/thisstoo.jpg Disallow: /wp-includes/here/here2/anythinginhere.aswelletc.If you use this; Disallow: /wp-includes(without the / at the end)then it would not only block the above, but also Disallow: /wp-includes-this Disallow: /wp-includesplusthis Disallow: /wp-includes-thistoo-andthebelow Disallow: /wp-includess